With the cascade modules, four SAT-ZF polarization levels, including terrestrial signals (e.g., FM radio), can be distributed to multiple SAT receivers. SPU 556-09 = 6 receivers, SPU 558-09 = 8 receivers, SPU 5512-09 = 12 receivers, and SPU 5518-09 = 18 receivers. For a cascade system using the cascade modules SPU 556-09, SPU 558-09, SPU 5512-09, or SPU 5518-09, you will need one of the polarity switches SPU 56-09, 510-09, or 516-09. Please refer to the operating manual of the polarity switch during commissioning. Connect the outputs of the polarity switches to the inputs of the cascade modules. Use F/F quick-fix adapters (not included) to easily connect the devices together. If you are using multiple cascade modules, connect the outputs of one cascade module to the inputs of another cascade module, and so on. Note: Depending on the system configuration (signal losses), additional polarity switches may be required to amplify the pass-through signals when using multiple cascade modules. Terminate the outputs of the last cascade module with the termination resistors included with the polarity switch. Connect the side participant outputs to the antenna sockets. For all RF connections, use highly shielded coaxial cables with F connectors.